Gain-Based Mechanism for pH Sensing Based on Random Lasing

Michele Gaio, Soraya Carlos Caixeiro, Benedetto Marelli, Fiorenzo Omenetto, Riccardo Sapienza

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)
170 Downloads (Pure)


Here, we investigate the mechanism of a random-lasing-based sensor which shows pH sensitivity exceeding by 2 orders of magnitude that of a conventional fluorescence sensor. We explain the sensing mechanism as related to gain modifications and lasing-threshold nonlinearities. A dispersive diffusive lasing theory matches the experimental results well, and it allows us to predict the optimal sensing conditions and a maximal sensitivity as large as 200 times that of an identical fluorescence-based sensor. The lack of complex alignment and the high sensitivity make this mechanism promising for future biosensing applications.
Original languageEnglish
Article number034005
Pages (from-to)034005-1-034005-6
Number of pages6
Issue number3
Early online date6 Mar 2017
Publication statusPublished - Mar 2017


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